Trigger.

A trigger is whatever kicks off an automated run. You set one up when you build a routine, and from then on the agent starts itself instead of waiting for you.

Three common ones: a time-based schedule (every morning at 7), an Webhook (something happens in another app and it pings yours), or a repo event (you push code to GitHub and it fires). You pick the trigger that matches when you want the work to happen, and Claude runs it from there.

The split worth holding in your head: a schedule fires on the clock, a webhook fires on an event. Most automations are just the right trigger wired to the right job.